Bulletin of the American Physical Society
19th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 60, Number 8
Sunday–Friday, June 14–19, 2015; Tampa, Florida
Session F5: Equation of State V: Metals |
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Chair: Brandon La Lone, NNSA Nevada Test Site, Dayne Fratanduono, Lawrence Livermore National Laboratory Room: Grand I/J |
Monday, June 15, 2015 5:00PM - 5:15PM |
F5.00001: Core-Level Crossing and the High-Pressure Equation of State of Heavy Elements John Wills The structural properties of the {\it 5d} transition metal osmium have recently been probed at static pressures up to $\sim$ 770 GPa [1]. In this study, anomalies in the {\it hcp} {\it c/a} ratio were found at pressures of in the vicinity of 150 GPa and 440 GPa. The anomaly at 150 GPa approximately coincides in pressure with an electron topological transition (ETT) observed in Density Functional Theory (DFT) band structure [1]. However, no ETT is observed at higher pressures. Instead, we find that the anomaly in the $c/a$ ratio of osmium is correlated with the crossing of the $5p_{3/2}$ and $4f_{7/2}$ ``core'' levels, which at this pressure are found to have bandwidths $\sim$ .2-.3 Ry, in our DFT calculations. In this talk, I discuss the calculated structural properties and calculated equation of state of osmium and other heavy {\it 5d} elements at pressures less than 1 TPa and the effect of core-level crossing on the equation of state and structural properties of these elements.\\[4pt] [1] Dubrovinsky, L., {\it et. al.}, in preparation. [Preview Abstract] |
Monday, June 15, 2015 5:15PM - 5:30PM |
F5.00002: A simple multiphase Cerium equation of state Scott Crockett, Kevin Honnell Cerium is a phase rich material which includes an isostructural FCC phase transition. In recent years many experiments have been performed measuring the phase boundaries as well as bulk moduli during the isostructural phase transition. We describe a practical established multiphase framework to model the isostructural phase transition utilizing a simplified modeling approach. [Preview Abstract] |
Monday, June 15, 2015 5:30PM - 5:45PM |
F5.00003: Equations of state of metals in WDM region Igor Lomonosov We present wide-range semi-empirical EOS model for metals. It fully assigns the free energy thermodynamic potential for metals over entire phase diagram region of practical interest. The model accounts for solid, liquid, plasma states as well as two-phase regions of melting and evaporation. Novel experimental data in WDM region are discussed. They include results of dynamic experiments on shock compression and isentropic expansion of solid and porous metals and information, obtained under conditions of heating by powerful electric current. We present comparison with isobaric expansion, isochoric plasma vessel and ``sandwiched'' foil experiments for Al, Ti, Fe and W and discuss their consistency with shock-wave data. [Preview Abstract] |
Monday, June 15, 2015 5:45PM - 6:00PM |
F5.00004: ABSTRACT WITHDRAWN |
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